Η πολική νύχτα ξεκίνησε σήμερα και θα διαρκέσει περίπου, μέχρι τις 23 Ιανουρίου. Κατά τη διάρκειά της ο ουρανός δεν είναι τελείως σκοτεινός. Κάποια φαινόμενα όπως το αστικό λυκόφως η πανσέληνος ή το Βόρειο Σέλας, επιτρέπουν την ύπαρξη φωτός.
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